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Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Critical Points
One of the most important means of investigating the properti...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Nickel
Nickel may be considered as the toughest among the non-rare a...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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